NR 505 ADVANCED RESEARCH WEEK 3 QUANTITATIVE RESEARCH.NR 505 ADVANCED RESEARCH WEEK 3 QUANTITATIVE RESEARCH. The focus of the Week 3 discussion is on two important elements of quantitative research studies- design and sampling. The approach or design, quantitative or qualitative, also applies to EBP projects. Both quantitative and qualitative have different designs or traditions that fall under these two broad categories. Select a single-study quantitative research study articl...